Author: Peter Berger
Date: 10:36:19 06/27/02
Go up one level in this thread
On June 27, 2002 at 04:04:07, Vincent Diepeveen wrote:
>Hello,
>
>Several positions in WM test the solutions given aren't the
>objective best moves.
>
>For example i get impression that at position 16:
>
>
>r1k4r/1b1q1pp1/p6p/3n4/1B3Pn1/1P1B4/P1PQ3P/2KRR3 w - - bm Ba5; id "CSS WM-Test
>16) Lb4-a5 (K)";
>
>Undoubtfully Ba5 is a good move, but completely material
>winning is c2-c4 here. You get directly a rook at the 7th rank,
>swallow f7 + g7, and black is completely immobilized the rest of
>the game. Soon also Rd1-e1-e7 happens and it's a mate in XXX soon
>then.
>
>I can imagine why a human plays Ba5 here and doesn't take a risk (note
>the chessprograms want this all initially too), but let's look objective
>to the position. Not finding c4 soon means a program is a tactical joke.
>
>As a human i wouldn't find c4 so soon either. I would go for Ba5, because
>i know how much i suck in tactics.
>
>Best regards,
>Vincent
This is what I get with Crafty 17.13:
14-> 28:00 0.00 1. c4 Nxb4 2. Qxb4 Nf6 3. Re7 Qc6 4.
Bf5+ Kb8 5. Rd6 Qh1+ 6. Rd1 Qc6
15 36:53 0.00 1. c4 Nxb4 2. Qxb4 Nf6 3. Re7 Qc6 4.
Bf5+ Kb8 5. Rd6 Qh1+ 6. Rd1 Qc6
15 125:37 0.20 1. Ba5 Ngf6 2. c4 Nc7 3. Qb4 Re8 4.
Rxe8+ Nfxe8 5. Qc5 g6 6. Bxg6 fxg6
7. Rxd7 Kxd7 8. Qd4+ Kc8 9. Kd2 Bf3
15-> 125:37 0.20 1. Ba5 Ngf6 2. c4 Nc7 3. Qb4 Re8 4.
Rxe8+ Nfxe8 5. Qc5 g6 6. Bxg6 fxg6
7. Rxd7 Kxd7 8. Qd4+ Kc8 9. Kd2 Bf3
Crafty 17.13 gets 1. c4 very fast with negative score and then drawscore soon.
It needs a long time to find 1. Ba5 with a slight positive score. I expect it to
fail-high on Ba5 in ply 16.
If 1.c4 is completely material winning it must be very deep and tough for
computers. If you let Diep think for a long time, will it keep with 1. c4 or
will it change its mind to 1. Ba5 eventually ?
Regards,
Peter
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